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[Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Available-for-sale Securities at Fair Value Available-for-sale Securities Trading Securities at Fair Value Debt Securities, Trading, and Equity Securities, FV-NI Marketable Securities Marketable Securities Total Assets at Fair Value Assets, Fair Value Disclosure Foreign exchange forward contract Fair Value Hedge Liabilities Total Liabilities at Fair Value Financial and Nonfinancial Liabilities, Fair Value Disclosure Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized holding gains (losses) arising during the period Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Reclassification of net (gains) losses on sales included in investment 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Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Remainder of 2018 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2019 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five 2019 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter 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Stock-based compensation Share-based Compensation Unrealized losses on derivatives Unrealized Gain (Loss) on Derivatives Net realized and unrealized gains on privately-held equity investments Gain (Loss) on Investments Gain on sale of BM&FBOVESPA shares Gain (Loss) on Sale of Investments Gain on sale of Bolsa Mexicana de Valores, S.A.B de C.V. Gain (Loss) on Sale of Other Investments Income tax expense reclassifed from accumulated other comprehensive income upon final sale of BM&FBOVESPA Reclassification from AOCI, Current Period, Tax Undistributed earnings, net of losses, of unconsolidated subsidiaries Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Deferred income taxes Deferred Income Tax Expense (Benefit) Change in: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Other current assets Increase (Decrease) in Prepaid Expense and Other Assets Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Income taxes payable Increase (Decrease) in Income Taxes Payable Other current liabilities Increase (Decrease) in Other Accrued Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Other Other Noncash Income (Expense) Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from maturities of available-for-sale marketable securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Purchases of available-for-sale marketable securities Payments to Acquire Available-for-sale Securities Purchases of property, net Payments to Acquire Property, Plant, and Equipment Investments in privately-held equity investments Payments to Acquire Investments Proceeds from sale of privately-held equity investments Proceeds from Sale and Maturity of Other Investments Proceeds from sale of BM&FBOVESPA shares Proceeds from Sale of Available-for-sale Securities, Equity Proceeds from sale of Bolsa Mexicana de Valores, S.A.B de C.V. 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